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44 Cards in this Set
- Front
- Back
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Pertains to a process that requires the absorption of heat |
Endothermic |
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Pertains to the reaction of a process that expels heat |
Exothermic |
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A substance that increases the rate of a chemical reaction without itself undergoing any permanent change |
Catalyst |
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Continuous process in which a small amount of concentrated boiler water is continuously drained |
Continuous blowdown |
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The action of purifying a liquid by a process of heating or Cooling |
Distillation |
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What goes in must come out |
Material balance |
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Performed on an as-needed basis larger quantities of water are periodically drain from the boiler by drain connections |
Intermittent blowdown |
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A distillation column can have a number of different trays or packing materials inside. What is the purpose for the internal components?Q ws |
Direct the flow and force vapor and liquid contact. |
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What is the "temperature profile" for a distillation column. |
Difference between the temperature of the bottom and the temperature of the top, - range |
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It is important to have liquid at the bottom of the distillation column. What is the liquid used for that makes it so important? |
It's the heat transfer medium for the reboiler |
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Could a distillation column be designed such that there is no external reflux back to the column? |
Yes but your boiling points would have to be very far apart |
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For a distillation column to operate efficiently, what must be happening at every tray in the column? |
Vapor / liquid contact, heat transfer, particle vaporization and condensation, and compositional change. |
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Vessel designed to separate components in the particular feed mixture |
Distillation column |
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Shell and Tube heat exchanger that up supplies heat for the distillation column |
Reboiler |
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Shell and Tube exchanger used to condense the column over head pressure |
Overhead condenser |
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Shell and Tube heat exchanger used to complete the condensation overhead vapor |
After condenser |
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Centrifugal pump that removes liquid bottoms product from the distillation column |
Bottoms pump |
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Pumps overhead liquid from the surge tank for reflux and overhead product |
Overhead and reflux pump |
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What variable most directly affects the set point for the steam flow controller FIC 40? |
Level (column/LIC 41) |
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What variable most directly affects the set point for the bottoms flow controller, FIC 45? |
Temperature (TIC 48 column) |
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Providing fic 42 is functioning properly, what is the only thing that should cause a change in the reflex flow to the distillation column? |
Operator |
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A very minor adjustment is needed to correct the fact that more than the acceptable amount of Heavies is going out of the top of the column. What are the options for this adjustment? |
Increase the reflux or steam to the reboiler. |
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A very minor adjustment as needed to correct the fact that there are more than the acceptable amount of light ends going out of the bottom of the column. What are the options for this adjustment? |
Decrease FIC 42 (reflux) or increase FIC 40 (steam) |
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Where must heat transfer take place for the distillation to be efficient and effective |
At each tray |
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What specifically contains more of the low boiling point components of the mixture than the liquid on each tray |
Just above the liquid level on each tray |
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What determines the capacity or throughput of a distillation column |
Steam capacity |
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What two variables provide an indication of the distillation capability |
Temperature and pressure |
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What is Rich absorbent fluid what is lean absorbent fluid |
Rich is contaminated, lean is clean |
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What is meant by the term sparging steam into the stripper |
Dispersing or injecting through liquid using a series of nozzles |
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In the absorber what is meant by the term saturation? |
Cannot absorb any more absorption limit |
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What are the desirable conditions for absorption |
Low temperature high pressure |
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What are the desirable conditions for stripping |
High temperature low pressure |
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Vessel designed for stripping Catalyst from the rich absorbent fluid |
Stripper column |
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Vessel designed for Catalyst Vapor to be absorbed into the lean absorbent fluid |
Absorber column |
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Shell and Tube heat exchanger that chills the lean absorbent steam to the absorber |
Lean absorbent chiller |
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Shell and tube heat exchanger that preheat switch absorbent fluid to the stripper and cools stripped catalyst vapor from the stripper |
Rich absorbent catalyst vapor heat exchanger |
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Pumps when absorbent and condensed steam from the stripper column |
Stripper bottoms pump |
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Pumps rich absorbent from the absorbers column to the stripper column |
Absorbers bottoms pump |
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Pumps liquid from the liquid/gas separator to the decanter |
S3 separator liquid pump |
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Separates condensed liquid from catalyst vapors |
Liquid/gas separator |
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What is the dual purpose for the e7 heat exchanger |
The tube side preheats absorber fluid before entering the stripper. The shell side is for cooling vapors |
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What physical barrier prevents the pressure Equalization between the D3 absorbers positive pressure and the D2 stripper vacuum |
Liquid level at the bottom of the column |
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List the instruments, controllers, and indicators that should be included when checking the material balance on the absorber and stripper system. |
FI 58 Absorber makeup, condensate, and FI 52 steam |
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Using the appropriate indicators and controllers in the system, calculate how much catalyst (pound per pound) is being absorbed, stripped, and recycled to the reactor |
FIC 51(20571) + FI 57(18000) = Catalyst(2571) |
